/*********************************************************************
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* NAN - Native Abstractions for Node.js
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*
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* Copyright (c) 2018 NAN contributors
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*
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* MIT License <https://github.com/nodejs/nan/blob/master/LICENSE.md>
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********************************************************************/
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#ifndef NAN_JSON_H_
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#define NAN_JSON_H_
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#if NODE_MODULE_VERSION < NODE_0_12_MODULE_VERSION
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#define NAN_JSON_H_NEED_PARSE 1
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#else
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#define NAN_JSON_H_NEED_PARSE 0
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#endif // NODE_MODULE_VERSION < NODE_0_12_MODULE_VERSION
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#if NODE_MODULE_VERSION >= NODE_7_0_MODULE_VERSION
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#define NAN_JSON_H_NEED_STRINGIFY 0
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#else
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#define NAN_JSON_H_NEED_STRINGIFY 1
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#endif // NODE_MODULE_VERSION >= NODE_7_0_MODULE_VERSION
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class JSON {
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public:
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JSON() {
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#if NAN_JSON_H_NEED_PARSE + NAN_JSON_H_NEED_STRINGIFY
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Nan::HandleScope scope;
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Nan::MaybeLocal<v8::Value> maybe_global_json = Nan::Get(
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Nan::GetCurrentContext()->Global(),
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Nan::New("JSON").ToLocalChecked()
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);
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assert(!maybe_global_json.IsEmpty() && "global JSON is empty");
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v8::Local<v8::Value> val_global_json = maybe_global_json.ToLocalChecked();
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assert(val_global_json->IsObject() && "global JSON is not an object");
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Nan::MaybeLocal<v8::Object> maybe_obj_global_json =
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Nan::To<v8::Object>(val_global_json);
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assert(!maybe_obj_global_json.IsEmpty() && "global JSON object is empty");
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v8::Local<v8::Object> global_json = maybe_obj_global_json.ToLocalChecked();
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#if NAN_JSON_H_NEED_PARSE
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Nan::MaybeLocal<v8::Value> maybe_parse_method = Nan::Get(
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global_json, Nan::New("parse").ToLocalChecked()
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);
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assert(!maybe_parse_method.IsEmpty() && "JSON.parse is empty");
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v8::Local<v8::Value> parse_method = maybe_parse_method.ToLocalChecked();
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assert(parse_method->IsFunction() && "JSON.parse is not a function");
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parse_cb_.Reset(parse_method.As<v8::Function>());
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#endif // NAN_JSON_H_NEED_PARSE
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#if NAN_JSON_H_NEED_STRINGIFY
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Nan::MaybeLocal<v8::Value> maybe_stringify_method = Nan::Get(
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global_json, Nan::New("stringify").ToLocalChecked()
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);
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assert(!maybe_stringify_method.IsEmpty() && "JSON.stringify is empty");
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v8::Local<v8::Value> stringify_method =
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maybe_stringify_method.ToLocalChecked();
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assert(
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stringify_method->IsFunction() && "JSON.stringify is not a function"
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);
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stringify_cb_.Reset(stringify_method.As<v8::Function>());
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#endif // NAN_JSON_H_NEED_STRINGIFY
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#endif // NAN_JSON_H_NEED_PARSE + NAN_JSON_H_NEED_STRINGIFY
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}
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inline
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Nan::MaybeLocal<v8::Value> Parse(v8::Local<v8::String> json_string) {
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Nan::EscapableHandleScope scope;
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#if NAN_JSON_H_NEED_PARSE
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return scope.Escape(parse(json_string));
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#else
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Nan::MaybeLocal<v8::Value> result;
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#if NODE_MODULE_VERSION >= NODE_0_12_MODULE_VERSION && \
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NODE_MODULE_VERSION <= IOJS_2_0_MODULE_VERSION
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result = v8::JSON::Parse(json_string);
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#else
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#if NODE_MODULE_VERSION > NODE_6_0_MODULE_VERSION
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v8::Local<v8::Context> context_or_isolate = Nan::GetCurrentContext();
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#else
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v8::Isolate* context_or_isolate = v8::Isolate::GetCurrent();
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#endif // NODE_MODULE_VERSION > NODE_6_0_MODULE_VERSION
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result = v8::JSON::Parse(context_or_isolate, json_string);
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#endif // NODE_MODULE_VERSION >= NODE_0_12_MODULE_VERSION &&
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// NODE_MODULE_VERSION <= IOJS_2_0_MODULE_VERSION
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if (result.IsEmpty()) return v8::Local<v8::Value>();
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return scope.Escape(result.ToLocalChecked());
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#endif // NAN_JSON_H_NEED_PARSE
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}
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inline
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Nan::MaybeLocal<v8::String> Stringify(v8::Local<v8::Object> json_object) {
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Nan::EscapableHandleScope scope;
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Nan::MaybeLocal<v8::String> result =
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#if NAN_JSON_H_NEED_STRINGIFY
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Nan::To<v8::String>(stringify(json_object));
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#else
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v8::JSON::Stringify(Nan::GetCurrentContext(), json_object);
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#endif // NAN_JSON_H_NEED_STRINGIFY
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if (result.IsEmpty()) return v8::Local<v8::String>();
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return scope.Escape(result.ToLocalChecked());
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}
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inline
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Nan::MaybeLocal<v8::String> Stringify(v8::Local<v8::Object> json_object,
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v8::Local<v8::String> gap) {
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Nan::EscapableHandleScope scope;
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Nan::MaybeLocal<v8::String> result =
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#if NAN_JSON_H_NEED_STRINGIFY
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Nan::To<v8::String>(stringify(json_object, gap));
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#else
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v8::JSON::Stringify(Nan::GetCurrentContext(), json_object, gap);
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#endif // NAN_JSON_H_NEED_STRINGIFY
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if (result.IsEmpty()) return v8::Local<v8::String>();
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return scope.Escape(result.ToLocalChecked());
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}
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private:
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NAN_DISALLOW_ASSIGN_COPY_MOVE(JSON)
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#if NAN_JSON_H_NEED_PARSE
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Nan::Callback parse_cb_;
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#endif // NAN_JSON_H_NEED_PARSE
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#if NAN_JSON_H_NEED_STRINGIFY
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Nan::Callback stringify_cb_;
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#endif // NAN_JSON_H_NEED_STRINGIFY
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#if NAN_JSON_H_NEED_PARSE
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inline v8::Local<v8::Value> parse(v8::Local<v8::Value> arg) {
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assert(!parse_cb_.IsEmpty() && "parse_cb_ is empty");
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AsyncResource resource("nan:JSON.parse");
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return parse_cb_.Call(1, &arg, &resource).FromMaybe(v8::Local<v8::Value>());
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}
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#endif // NAN_JSON_H_NEED_PARSE
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#if NAN_JSON_H_NEED_STRINGIFY
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inline v8::Local<v8::Value> stringify(v8::Local<v8::Value> arg) {
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assert(!stringify_cb_.IsEmpty() && "stringify_cb_ is empty");
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AsyncResource resource("nan:JSON.stringify");
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return stringify_cb_.Call(1, &arg, &resource)
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.FromMaybe(v8::Local<v8::Value>());
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}
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inline v8::Local<v8::Value> stringify(v8::Local<v8::Value> arg,
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v8::Local<v8::String> gap) {
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assert(!stringify_cb_.IsEmpty() && "stringify_cb_ is empty");
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v8::Local<v8::Value> argv[] = {
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arg,
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Nan::Null(),
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gap
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};
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AsyncResource resource("nan:JSON.stringify");
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return stringify_cb_.Call(3, argv, &resource)
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.FromMaybe(v8::Local<v8::Value>());
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}
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#endif // NAN_JSON_H_NEED_STRINGIFY
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};
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#endif // NAN_JSON_H_
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